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WO1996034019A1 - Procede de traitement thermique de pastilles de polyester - Google Patents

Procede de traitement thermique de pastilles de polyester Download PDF

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Publication number
WO1996034019A1
WO1996034019A1 PCT/US1996/005702 US9605702W WO9634019A1 WO 1996034019 A1 WO1996034019 A1 WO 1996034019A1 US 9605702 W US9605702 W US 9605702W WO 9634019 A1 WO9634019 A1 WO 9634019A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid medium
temperature
pellets
unit
polyester
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1996/005702
Other languages
English (en)
Inventor
Gregory J. Kimball
Ilya Pikus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bepex International LLC
Original Assignee
Hosokawa Bepex Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hosokawa Bepex Corp filed Critical Hosokawa Bepex Corp
Priority to AU55712/96A priority Critical patent/AU5571296A/en
Publication of WO1996034019A1 publication Critical patent/WO1996034019A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/88—Post-polymerisation treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
    • B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
    • B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
    • B29B7/16—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft with paddles or arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
    • B29B7/22—Component parts, details or accessories; Auxiliary operations
    • B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/823—Temperature control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/82—Heating or cooling
    • B29B7/826—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/88—Adding charges, i.e. additives
    • B29B7/94—Liquid charges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C08G63/80—Solid-state polycondensation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/16—Auxiliary treatment of granules
    • B29B2009/165—Crystallizing granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0041—Crystalline

Definitions

  • This invention relates to a method for preparation of high molecular weight polyester material, such as pellets or coarse powder, by the solid state crystallization and polymeriza ⁇ tion or polycondensation of polyesters of lower molecular weight.
  • the common commercial practice for producing high molecular weight polyester in the solid state involves thermal processing in an inert gas atmosphere or under vacuum at temper ⁇ atures below the material melting point.
  • High crystallization and/or polymerization rates can be achieved at substantially elevated temperature, but in commercial practice, the reaction temperature is usually restricted by the relatively low sticking temperature of polyester particles.
  • the tendency of the polyes ⁇ ter particles to agglomerate when the sticking temperature is reached requires special efforts and technical means to prevent the undesirable effects of such agglomeration and caking in the crystallization/polymerization apparatus during the critical sticky phase.
  • the amorphous polyes ⁇ ter pellets are treated with water, saturated steam or organic solvents at temperatures up to 110 * C to effect at least partial crystallization of the granules.
  • the granules are dried at a temperature of about 160" C to 170 * C while holding movement of the granules to a minimum.
  • This invention provides an improved process for solid state crystallization and/or polymerization of polyester pellets by thermally processing polymeric materials in an agitated heating liquid medium at optimal temperatures slightly below the sticking temperature of the polyester.
  • the process conditions are maintained by controlling the boiling liquid temperature either by the pressure in the crystallizer/reactor and/or by the chemical composition of the liquid medium.
  • Pressurized or so-called “superheated” water can be used as a liquid medium in the process proposed.
  • the boiling water temperature can easily be controlled by changing the static pressure in the crystallizer/reactor. For example, under an atmospheric pressure of 14.7 psi absolute, water boils at 212 * F. At 50 psi absolute, the boiling temperature is 281* F., and at 100 psi absolute, the boiling temperature is 328 * F.
  • the crystallization and poly ⁇ merization of the polyester pellets can be carried out at temper ⁇ atures higher than their usual sticking temperatures and often extending up to within 10 * F. or less of their sticking tempera ⁇ ture. Since in the course of the thermal processing the optimal crystallization/polymerization temperature will vary usually over a wide range, the ability to control the process temperature by means of such a simple operation as the static pressure control in the crystallizer/reactor makes the method proposed very efficient in comparison with previous commercial operations.
  • the process temperature can be controlled either by changing the static pressure in the crystallizer/reactor or by means of maintaining the proper water content in the aqueous heating liquid medium.
  • pure 100% ethylene glycol boils at 388* F. at atmospheric pressure.
  • Figure 1 is a side elevational view, partly cut away, of a material handling unit of a type suitable for use in the practice of the invention? and.
  • Figure 2 is an end elevational view of the unit of Figure 1.
  • FIG. 1 illustrate a material handling unit 10 of the type manufactured by Hosokawa Bepex Corporation under the trademark SOLIDAIRE*.
  • This unit includes an agitator having paddles 12 mounted on rotor 14 supported within cylindrical housing 16.
  • the housing includes inner wall 18 whereby steam or hot oil can be introduced at inlets 19 for circulation in the space 20 defined between the inner and outer walls. Condensation or oil may be removed through outlets 22.
  • Polymer pellets are introduced through inlet 23 and the processed material exits through outlet 24.
  • An additional inlet is introduced
  • This liquid medium is mixed with the polymer pellets for controlling reac ⁇ tions within the unit 10 as will be discussed in greater detail.
  • the liquid entering the unit through inlet 21 is first moved by means of pump 25 through heater 26 and pressure regula ⁇ tor 27.
  • the heater 26 controls the temperature of the liquid and a pressure sensor 28 is located at a downstream position to control the pressure regulator to ensure maintenance of pressure in the unit 10 at a preselected level.
  • Outlet 32 of the unit 10 is provided to recirculate water or other liquid through the system. Polymer granules are prevented from passing into the outlet by means of a perforated liquid intake separator.
  • the line 34 from outlet 32 communicates with the feed line 36 which connects to pump 25 whereby the liquid from outlet 32 can be recirculated.
  • Excess liquid drain regulator 43 is used in conjunction with outlet 32.
  • Make-up liquid can also be added to line 36 for deliv ⁇ ery to pump 25 by means of regulator 39.
  • This regulator is controlled by sensor 40 which detects the water (or solvent) content of the liquid medium in the unit 10.
  • the system described is readily adaptable to the use of water for controlling the processing conditions of polymer pellets introduced to the unit through inlet 23.
  • the water is heated to a desired temperature by means of heater 26 with the temperature being chosen depending on the ideal processing conditions for the particular polymer being processed. Since this temperature may well exceed the boiling point of water at atmospheric pressure, pressure sensor 28 is employed to ensure that the water is maintained at a pressure adequate to ensure that the water remains in the liquid state. The pressure is maintained since pump 25 will be constantly applying pressure and regulator 27 will be automatically adjusted depending on the output of sensor 28.
  • polyester pellets are processed at 250" F. - 360" F. Water introduced, for instance, at 320 * F. will remain in the liquid state for admixture with the pellets as long as the pressure within unit 10 is maintained at 100 psi absolute or higher. Added heat supplied through the jacketed walls of the unit 10 will supplement this heat input to achieve the desired temperature level.
  • the heating liquid medium may also comprise a solvent such as an aqueous ethylene glycol solution.
  • polyester pellets are mixed with a 30% water, ethylene glycol solution introduced at 260" F. The unit pressure is maintained at 50 psi absolute to ensure that the solvent remains in the liquid state.
  • Very heat sensitive polyester pellets containing a relatively high concentration of copolymers have lower sticking temperatures. These materials can be processed effectively in water or in a water miscible organic liquid medium under atmos ⁇ pheric pressure conditions. Where the sticking temperature exceeds 212" F, higher alcohols, for example hexanol with a boiling point of 315" F at atmospheric pressure can be used as the liquid medium.
  • Processing with the unit 10 may be conducted in a batch mode wherein a fixed amount of pellets and liquid are introduced, and the unit entry and egress locations sealed during agitation. This form of operation is particularly suited to processing which is conducted over several hours to completion. Where the pro ⁇ cessing can be conducted during a reasonably short time period as the pellets are transported from one end of the unit 10 to the other, a continuous operation is contemplated.
  • the speed of the rotor 14 should be maintained high enough to prevent agglomeration of sticky polymer granules and to provide a reasonable rate of heat transfer in the system. However, the top speed of the rotor can be much lower than used in processing wherein the crystallizer is "air-filled". By employing lower speed to avoid sticking, an undesirable genera ⁇ tion of fines and/or deformation of polymer pellets is also avoided.
  • the method of this invention using an agitated heating liquid medium is quite advantageous due to high thermal efficien ⁇ cy achieved because of the very high heat transfer rates in the liquid-solid system.
  • the method permits control of the process temperature at the highest optimal level (only slightly below the polyester sticking temperature) thereby providing a most economical process.
  • the method of this invention provides continuous movement and steady agitation of the pellets in the liquid medium with a minimum effort. Liquid is an excellent lubricator, and the fines generation during thermal processing in a liquid medium as called for by this invention is therefore negligible.
  • the method of this invention also provides greater flexibility as to reaction rates by the use of optimal reaction temperature kinetics. Thus, the temperature during processing can be controlled by a simple change of pressure and/or water content of the heating liquid medium by obtaining higher molecu ⁇ lar weight products than were possible in the prior art.
  • the system is especially suited for microprocessor or computer control programmed to achieve maximum efficiency depend ⁇ ing on the particular characteristics of the polymer to be treated.
  • the control unit employed may receive input from sensors 28 and 40 previously described.
  • thermocou ⁇ ple 42 is connected to regulator 41 for heater 26 and this provides further input for a program designed for the system. Specifically, the temperature controller will "react" to tempera ⁇ ture changes which occur due to changes provided by the pressure regulator 27 and water/solvent content regulator 39.
  • the water/solvent content sensor 40 may comprise, for example, the Continuous Moisture Analyzer Model BSP-901 with Radio Frequency Moisture Probe manufactured by Moisture Register Products Co. of LaVerne, California. Any one of many available flow rate regulators may be used for regulator 39.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyesters Or Polycarbonates (AREA)

Abstract

Procédé de traitement thermique de pastilles de polyester par cristallisation et polymérisation à l'état solide, qui consiste à prévoir une unité de traitement confinée dans laquelle on introduit les pastilles conjointement avec un milieu liquide. On agite ensuite la combinaison des pastilles et du milieu liquide pour les mélanger tout en régulant la température du mélange agité pour obtenir le traitement desdites pastilles dans le milieu liquide de chauffage agité à une température légèrement inférieure à la température de solidification du polyester. On continue le traitement pendant une période suffisante pour augmenter sensiblement la cristallinité et la masse molaire du polyester.
PCT/US1996/005702 1995-04-26 1996-04-24 Procede de traitement thermique de pastilles de polyester Ceased WO1996034019A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU55712/96A AU5571296A (en) 1995-04-26 1996-04-24 Method for thermally processing polyester pellets

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/427,801 US5532335A (en) 1995-04-26 1995-04-26 Method for thermally processing polyester pellets
US08/427,801 1995-04-26

Publications (1)

Publication Number Publication Date
WO1996034019A1 true WO1996034019A1 (fr) 1996-10-31

Family

ID=23696342

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/005702 Ceased WO1996034019A1 (fr) 1995-04-26 1996-04-24 Procede de traitement thermique de pastilles de polyester

Country Status (3)

Country Link
US (1) US5532335A (fr)
AU (1) AU5571296A (fr)
WO (1) WO1996034019A1 (fr)

Families Citing this family (37)

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US5750644A (en) * 1996-10-30 1998-05-12 Shell Oil Company Process for the crystallization of polyethylene naphthalate prepolymers and the solid stating of those crystallized prepolymers
US5744578A (en) * 1997-04-02 1998-04-28 Shell Oil Company Process for the crystallization of polyethylene naphthalate prepolymers and the solid stating of those crystallized prepolymers
US6103774A (en) * 1997-04-02 2000-08-15 The Coca-Cola Company Process for removing contaminants from polyesters and controlling polymer molecular weight
US6147129A (en) * 1998-10-01 2000-11-14 The Coca-Cola Company Method for treating polyesters and, in particular, cleaning and decontaminating polyesters
DE19848245A1 (de) * 1998-10-20 2000-05-04 Rieter Automatik Gmbh Verfahren zur Granulierung und Kristallisation von thermoplastischen Polyestern oder Copolyestern
FR2786494B1 (fr) * 1998-11-27 2001-01-05 Tergal Fibres Procede de fabrication de copolyesters poly(ethylene terephtalate)-poly(ethylene isophtalate)
US6125549A (en) * 1999-02-12 2000-10-03 Hosokawa Bepex Corporation Radiant heater system for thermally processing flowable materials
US6461575B1 (en) 1999-05-11 2002-10-08 Shell Oil Company Apparatus for crystallization of polytrimethylene terephthalate
DE60018275T2 (de) * 1999-05-11 2006-01-05 Shell Internationale Research Maatschappij B.V. Verfahren und vorrichtung zur kristallisation von polytrimethylenterephthalat
US6297315B1 (en) 1999-05-11 2001-10-02 Shell Oil Company Process for preparing polytrimethylene terephthalate
US6740733B2 (en) * 2001-11-30 2004-05-25 Shell Oil Company Process and apparatus for crystallization of polytrimethylene terephthalate (PTT)
DE10393897D2 (de) 2002-10-04 2005-08-25 Jan-Udo Kreyenborg Verfahren zur Granulierung von Kunststoffen
US20050167876A1 (en) * 2002-10-04 2005-08-04 Jan-Udo Kreyenborg Method for granulating plastics
US6935051B2 (en) * 2002-11-22 2005-08-30 Charles L. Stock Heating and drying apparatus for particulate material
US7329723B2 (en) * 2003-09-18 2008-02-12 Eastman Chemical Company Thermal crystallization of polyester pellets in liquid
CA2482056A1 (fr) * 2003-10-10 2005-04-10 Eastman Chemical Company Cristallisation thermique d'un polyester fondu dans un fluide
RU2292362C2 (ru) * 2003-10-17 2007-01-27 Бкг Брукманн Унд Крейенборг Гранулиртехник Гмбх Способ термической обработки гранул полиэтилентерефталата и устройство для ее осуществления
KR100725291B1 (ko) * 2003-10-17 2007-06-04 베카게 브루크만 운트 크라이엔보르크 그라눌리어테히닉 게엠베하 폴리에스테르 펠렛의 열처리 방법
US7157032B2 (en) * 2003-11-21 2007-01-02 Gala Industries, Inc. Method and apparatus for making crystalline PET pellets
CN1976786B (zh) * 2004-05-26 2011-10-26 特里奥凡德国有限公司及两合公司 无定形塑料粒料的结晶方法
US20060047102A1 (en) * 2004-09-02 2006-03-02 Stephen Weinhold Spheroidal polyester polymer particles
US7250486B1 (en) * 2004-12-15 2007-07-31 Uop Llc Method and apparatus for crystallizing polymer particles
DE102005008115A1 (de) * 2005-02-21 2006-08-31 Mann + Hummel Protec Gmbh Verfahren zum Kristallisieren eines amorphen Kunststoffgranulates
US7098299B1 (en) * 2005-03-16 2006-08-29 United Resource Recovery Corporation Separation of contaminants from polyester materials
US9032641B2 (en) 2005-05-26 2015-05-19 Gala Industries, Inc. Method and apparatus for making crystalline polymeric pellets and granules
US8361364B2 (en) * 2005-05-26 2013-01-29 Gala Industries, Inc. Method and apparatus for making crystalline polymeric pellets and granules
US7875184B2 (en) * 2005-09-22 2011-01-25 Eastman Chemical Company Crystallized pellet/liquid separator
CA2650610A1 (fr) * 2006-04-28 2007-11-08 Wellman, Inc. Procedes de fabrication de resines de polyester dans des reacteurs de polycondensation a l'etat fondu a film tombant
WO2008008836A2 (fr) * 2006-07-11 2008-01-17 Wellman, Inc. Catalyseur composite de polymérisation en phase solide
BRPI0721608A2 (pt) * 2007-05-11 2013-01-22 Uop Llc processo para a fabricaÇço de partÍculas polimÉricas, e, aparelho para a produÇço de partÍculas polimÉricas cristalizadas sàlidas
RU2446944C2 (ru) * 2007-05-11 2012-04-10 Юоп Ллк Способ и аппарат для кристаллизации полимерных частиц
ATE512774T1 (de) * 2007-12-18 2011-07-15 Borealis Tech Oy Entfernung flüchtiger verbindungen aus polymerpellets
DE102008061746A1 (de) 2008-12-12 2010-06-24 Treofan Germany Gmbh & Co. Kg Einschichtige mikroporöse Folie für Batterien mit Abschaltfunktion
DE102008061748A1 (de) 2008-12-12 2010-06-24 Treofan Germany Gmbh & Co. Kg Mehrschichtige mikroporöse Folie für Batterien mit Abschaltfunktion
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US4161578A (en) * 1978-05-12 1979-07-17 Bepex Corporation Process for solid phase polymerization of polyester
US4223128A (en) * 1978-05-16 1980-09-16 Celanese Corporation Process for preparing polyethylene terephthalate useful for beverage containers
US5090134A (en) * 1988-12-23 1992-02-25 Buhler Ag Method and apparatus for continuously crystallizing polyester material

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US3014011A (en) * 1957-02-20 1961-12-19 Onderzoekings Inst Res Process for drying polyester chips
US4161578A (en) * 1978-05-12 1979-07-17 Bepex Corporation Process for solid phase polymerization of polyester
US4223128A (en) * 1978-05-16 1980-09-16 Celanese Corporation Process for preparing polyethylene terephthalate useful for beverage containers
US5090134A (en) * 1988-12-23 1992-02-25 Buhler Ag Method and apparatus for continuously crystallizing polyester material

Also Published As

Publication number Publication date
AU5571296A (en) 1996-11-18
US5532335A (en) 1996-07-02

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